This report describes the historical weather record at the Beijing Capital International Airport (Beijing, China) during 2014. This station has records back to June 2006.
Beijing has a continental climate with dry winters and hot summers. The area within 25 mi of this station is covered by croplands (80%), shrublands (9%), built-up areas (6%), and grasslands (4%)
Daylight saving time (DST) was not observed at Beijing during 2014.
2014 was not a leap year, so it has 365 days and no February 29th. The first leap year before 2014 was 2012 and the first after was 2016.
The summer and winter solstices and the spring and fall equinoxes mark the passing of the seasons. They fall on nearly the same day each year, with differences of a day or two depending on the year. In 2014 they occurred on:
|Spring Equinox||Thursday, 20 March 2014.|
|Summer Solstice||Saturday, 21 June 2014.|
|Fall Equinox||Tuesday, 23 September 2014.|
|Winter Solstice||Sunday, 21 December 2014.|
The hottest day of 2014 was May 29, with a high temperature of 108°F. For reference, on that day the average high temperature is 85°F and the high temperature exceeds 93°F only one day in ten. The hottest month of 2014 was July with an average daily high temperature of 91°F.
Relative to the average, the hottest day was May 29. The high temperature that day was 108°F, compared to the average of 85°F, a difference of 23°F. In relative terms the warmest month was March, with an average high temperature of 61°F, compared to an typical value of 54°F.
The longest warm spell was from January 7 to February 3, constituting 28 consecutive days with warmer than average high temperatures. The month of January had the largest fraction of warmer than average days with 97% days with higher than average high temperatures.
The coldest day of 2014 was January 10, with a low temperature of 9°F. For reference, on that day the average low temperature is 15°F and the low temperature drops below 8°F only one day in ten. The coldest month of 2014 was December with an average daily low temperature of 19°F.
Relative to the average, the coldest day was May 15. The low temperature that day was 46°F, compared to the average of 57°F, a difference of 11°F. In relative terms the coldest month was August, with an average low temperature of 69°F, compared to an typical value of 70°F.
The longest cold spell was from August 4 to August 20, constituting 17 consecutive days with cooler than average low temperatures. The month of August had the largest fraction of cooler than average days with 71% days with lower than average low temperatures.
This station did not reliably report the cloud coverage during 2014 but there is enough reported data to warrant the inclusion of the following graphs.
The cloudiest month of 2014 was February, with 7% of days being more cloudy than clear.
This station provides hourly reports of significant weather events at and around the station, but does not report the quantity of precipitation at the station itself. This is common for weather stations located outside of the United States, and for a small subset of stations in the United States that are located at lesser used and smaller airports.
This station reports when significant weather events (including precipitation) are visually observed at or near the station. Such events do not always correspond to measured quantities of liquid equivalent precipitation, such as when the event is near by not at the station, or in the case of solid precipitation that does not melt in the collection basin.
The day in 2014 with the most precipitation observations was September 23. There were 22 hourly weather reports that day (out of a maximum of 24) in which some form of precipitation was observated at or near the station. The month with the most precipitation observations was August, with 79 hourly present weather reports involving some form of precipitation.
As determined by the present weather reports, the longest dry spell was from February 27 to March 28, constituting 30 consecutive days with no observed precipitation. The month with the largest fraction of days without observed precipitation was January, with 94% of days reporting no observed precipitation at all.
The month with the largest fraction of days with at least some observed precipitation was June, with 50% of days reporting some observed precipitation.
In this section we consider only those weather reports that indicate liquid precipitation. For the purposes of this analysis, we include thunderstorms even though some thunderstorms are not accompanied by liquid precipitation.
The month of 2014 with the largest number of those reports was August, with a total of 79 reports. The day with the largest number of those reports was September 23, with a total of 22 reports.
This station reports when snow is observed falling but does not report the quantity of snow that has fallen or the depth of snow on the ground.
In this section we consider hourly weather reports that contain an observation of falling snow. These reports do not necessarily correspond to accumulation.
The first reported snow fall in 2014 was on December 9; the last was on February 20. The month of 2014 with the largest number of those reports was February, with a total of 29 reports. The day with the largest number of those reports was February 7, with a total of 18 reports.
Humidity is an important factor in determining how weather conditions feel to a person experiencing them. Hot and humid days feel even hotter than hot and dry days because the high level of water content in humid air discourages the evaporation of sweat from a person's skin.
When reading the graph below, keep in mind that the hottest part of the day tends to be the least humid, so the daily low (brown) traces are more relevant for understanding daytime comfort than the daily high (blue) traces, which typically occur during the night. Applying that observation, the least humid month of 2014 was March with an average daily low humidity of 15%, and the most humid month was September with an average daily low humidity of 48%.
But it is important to keep in mind that humidity does not tell the whole picture and the dew point is often a better measure of how comfortable a person will find a given set of weather conditions. Please see the next section for continued discussion of this point.
Dew point is the temperature below which water vapor will condense into liquid water. It is therefore also related to the rate of evaporation of liquid water. Since the evaporation of sweat is an important cooling mechanism for the human body, the dew point is an important measurement for understanding how dry, comfortable, or humid a given set of weather conditions will feel.
Generally speaking, dew points below 50°F will feel a bit dry to some people, but comfortable to people accustomed to dry conditions; dew points from 50°F to 68°F are fairly comfortable to most people, and dew points above 68°F are increasingly uncomfortable, becoming oppressive around 77°F.
To take some examples, and basing our categorization on the daily high dew point in 2014, January had 31 dry days, no comfortable days, and no humid days; April had 20 dry days, 10 comfortable days, and no humid days; July had no dry days, 7 comfortable days, and 24 humid days; and October had 14 dry days, 17 comfortable days, and no humid days.
The highest sustained wind speed was 45 mph, occurring on December 31; the highest daily mean wind speed was 22 mph (January 20); and the highest wind gust speed was 58 mph (December 31).
The windiest month was December, with an average wind speed of 9 mph. The least windy month was September, with an average wind speed of 5 mph.
Visibility is the maximum distance at which a given reference object or light can be clearly discerned. In the United States, visibilities that are greater than or equal to 10 miles are typically reported as 10 miles.
The day of 2014 with the lowest average visibility was October 25, with an average visibility of 0.7 mi. The month with the lowest average visibility was February, with an average visibility of 2.6 mi. With an average visibility of 4.5 mi, the month of June had the highest average visibility.
The cloud ceiling is the altitude of the lowest layer of clouds that are at categorized as broken (mostly cloudy) or overcast (cloudy). If no such cloud layer exists then the ceiling is unlimited and no value is reported.
The day of 2014 with the lowest average cloud ceiling was October 20, with an average cloud ceiling of 200'. The month with the lowest average cloud ceiling was October, with an average cloud ceiling of 3149'. The month of April has the highest average cloud ceiling, with an average cloud ceiling of 4050'.